Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1973aeced30895…

MALICIOUS

PDF

81.4 KB Created: 2021-04-18 19:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cfaf88e6e9ec38d5bfa446a9a432185b SHA-1: f33ef6cbc42de56381ba7997c2a050e71006c350 SHA-256: db1973aeced3089580e6a3bf4f17dd35138f5d8f4ce4c570d836752877ed960c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The document body, though partially garbled, suggests a lure related to calendars or catalogs, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=calendario+oficial+2020+sep+mexico PDF link annotation
    • http://zesamoa.online/catalogo_lusac_bombas_de_clutchmdq0p.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/3680842.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/6036844.pdfIn PDF document text
    • http://obuv-kozha.ru/sharp_split_ac_remote_control_manual2g1uc.pdfIn PDF document text
    • http://aycotoro7.xyz/306198207911dxs9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_6062c8de16b41.pdfIn PDF document text
    • http://setofexperience.site/pasevoxrkhs1.pdfIn PDF document text
    • http://pipvip.ru/65349699120rs8uf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_605ef08e1749f.pdfIn PDF document text
    • http://salebox.shop/jasufigofolow1tzt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_6004bf2965c9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5febee05b2ad8.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/2ab872ebb0.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://leree6.club/greencoat_uk_wind_fact_sheetp6obv.pdfIn PDF document text
    • http://golomashvanna.xyz/mavokowajaxokufaxevores034e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fe827ce83cea.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/3845526.pdfIn PDF document text
    • http://esagafow.fun/annie_full_cast_listgfeed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_600ff5392df9f.pdfIn PDF document text
    • http://hocostyle.ru/vicks_germ_free_humidifier_instructions5keu6.pdfIn PDF document text
    • http://trujillostacoshop.com/success_story_of_amazon.comq6iga.pdfIn PDF document text
    • http://detonic-italy.website/38103200120vrvt1.pdfIn PDF document text
    • http://apsdd54gfv.xyz/77543985393otlyq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5372 bytes
SHA-256: 7b6f7ca655b9e951d83a2f341f46f5e8f3c40618abd5636ef02618a073d50b84
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 11828 bytes
SHA-256: 38eac233f2ed6fd8ba0a4910998e99e2b57f8841a8528f9b1b5b45834fc36db3
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3